Dimitri Kusnezov (The Hon. Dr.) is an American theoretical physicist and university professor who served as the fifth Under Secretary for Science and Technology at the U.S. Department of Homeland Security (2022–2025) and as the first Deputy Under Secretary for Artificial Intelligence and Technology at the U.S. Department of Energy (2018–2020). Through six administrations, he led large S&T organizations supporting high consequence, mission-critical decisions across U.S. nuclear weapons and national security, open science, law enforcement, and emergency management. His work emphasized emerging technologies—including AI, quantum, biosecurity, autonomous systems, and high-performance computing—translating first-of-kind capabilities from research into real-world operations. He has published 160+ papers and articles and edited two books, and has extensive experience managing the risks that come with high-hazard efforts where mistakes carry real operational and reputational consequences. Kusnezov began his career as a professor of theoretical physics at Yale University, working in quantum many-body theory and complex systems, having received his PhD and MA degrees from Princeton University in theoretical physics and AB degrees with highest honors in Physics and in Pure Mathematics from UC Berkeley.

2010年に量子コンピュータ向けの材料の研究で修士号。その後、事業会社で半導体領域に10年従事、R&D部門にて量子技術の研究を立上げ5年に渡り統括。量子機械学習や量子CAEのアルゴリズム開発から実装、量子通信の要素技術の実証まで幅広く取り組む。技術と事業の両面に通じ、産学の橋渡し役として先端技術の導入支援と社会実装を推進。グローバル連携にも力を入れており、米国量子ベンダーとの連携プロジェクトをリード。アカデミアの客員研究員、国家プロジェクトの採択審査委員、国際学会の技術審査員も務める。博士（工学）。